Ground Tyre Rubber/Waste Polypropylene Blends - Effect of Composition on Mechanical Properties
Ground Tyre Rubber/Waste Polypropylene Blends - Effect of Composition on Mechanical Properties
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DOI：
10.1177/147776060902500402
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发表时间：
2009-01-01
影响因子：
2.6
通讯作者：
Walpalage, Shantha
中科院分区：
文献类型：
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作者：
Egodage, Shantha Maduwage;Harper, John F.;Walpalage, Shantha
将废轮胎橡胶（GTR）与废聚丙烯（WPP）按9种不同配比共混，制备了GTR/WPP共混物。在Haake Rheocord Poly Lab系统中，在180 ° C的温度和30 r/min的转子速度下，8 min制备共混物。共混物的加工特性显示，随着GTR含量的增加，稳态混合扭矩增加，这表明在GTR负载高于30 wt.%时，加工难度增加。共混物的形态观察显示两相系统。将GTR分散在含有至多60重量%的共混物中的连续WPP基质中。随着GTR含量的增加，分散的GTR团聚体的尺寸增大。在70重量%时，GTR分散相变为连续相。拉伸强度、模量和撕裂强度随GTR含量的增加而降低，而断裂伸长率和冲击断裂能则增加。所有这些性能在低GTR含量下保持相对不变，表明在简单的橡胶热塑性共混物中获得橡胶样性能需要临界GTR水平。
Ground tyre rubber (GTR) was blended with waste polypropylene (WPP) in nine different compositions to prepare GTR/WPP blends. The blends were prepared in a Haake Rheocord Poly Lab system at a temperature of 180 degrees C and a rotor speed of 30 r/min for 8 min. The processing characteristics of the blends showed an increase in steady-state mixing torque with an increase in GTR content, suggesting an increased difficulty in processability at GTR loadings above 30 wt.%. Morphological observations of the blends showed two-phase systems. The GTR was dispersed in a continuous WPP matrix in blends containing up to 60 wt.% GTR, and the size of the dispersed GTR agglomerants increased with GTR content. At 70 wt.%, the GTR dispersed phase changed to a continuous phase. Tensile strength, modulus, and tear resistance decreased with GTR content, while the elongation at break and the impact failure energy increased. All these properties remained relatively unchanged at low GTR contents, suggesting that a critical GTR level is required to obtain rubber-like properties in a simple rubber thermoplastic blend.